Internal combustion engine waste heat recovery system

Abstract

The utility model relates to a waste heat recovery system of an internal combustion engine, which belongs to the technical field of waste heat recovery systems and comprises a first heat exchanger, a second heat exchanger and a flash tank. The second heat exchanger is communicated with a high-temperature cylinder sleeve water discharge hole and a low-temperature cylinder sleeve water return hole of the internal combustion engine; and the flash tank is communicated with a first high-temperature water outlet hole of the first heat exchanger and a second high-temperature water outlet hole of the second heat exchanger. The smoke cavity and the water cavity in the first heat exchanger are utilized for heat exchange, and the smoke cavity is communicated with the high-temperature smoke exhaust hole of the internal combustion engine, so that a large amount of smoke waste heat of the internal combustion engine can be recycled, the water vapor content in smoke is reduced, and white smoke is eliminated; due to the fact that the high-temperature water cavity is communicated with the high-temperature cylinder sleeve water discharging hole and the low-temperature cylinder sleeve water returning hole of the internal combustion engine, a large amount of waste heat of the cylinder sleeve water of the internal combustion engine can be recycled, and heat loss caused by direct discharging of the high-temperature cylinder sleeve water is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery systems, and particularly relates to a waste heat recovery system for an internal combustion engine. Background Technique

[0002] With the continuous enhancement of people's awareness of environmental protection, more and more industrial and mining enterprises choose to recover waste heat through various advanced energy utilization technologies to improve the energy utilization efficiency of the system, reduce pollutant and carbon emissions, and protect the ecological environment.

[0003] The gas-fired combined cooling, heating and power supply system with a gas internal combustion engine as the core has been widely used in industrial projects with a large demand for electricity and steam. The gas internal combustion engine generates electricity to meet the electricity demand of industrial enterprises, and its waste heat has two forms: flue gas and jacket water. The traditional internal combustion engine waste heat recovery system only recovers the waste heat of the flue gas. For example, in the invention patent with the patent number CN111947493A and the name of an internal combustion engine exhaust gas waste heat recovery system, the waste heat of the flue gas can be connected to a waste heat boiler to generate steam to meet the steam demand of the enterprise. However, the waste heat of the jacket water often cannot be effectively utilized in industrial scenarios lacking hot water demand and is generally released into the air through cooling towers, resulting in heat loss.

[0004] Therefore, how to design a recovery system with a simple structure, reasonable layout and capable of fully recovering the waste heat of a gas internal combustion engine is an urgent problem to be solved by those skilled in the art. Content of the Utility Model

[0005] The utility model provides a waste heat recovery system for an internal combustion engine, which solves the technical problem of waste heat and environmental pollution caused by the direct discharge of jacket water of an existing gas internal combustion engine.

[0006] The technical solution of the utility model to solve the above technical problem is as follows: a waste heat recovery system for an internal combustion engine, the internal combustion engine is provided with a high-temperature jacket water discharge hole, a low-temperature jacket water return hole and a high-temperature flue gas discharge hole, and includes: a first heat exchanger, a second heat exchanger and a flash tank.

[0007] The interior of the first heat exchanger has a smoke chamber and a water chamber that are independently distributed and in heat exchange contact. The side wall of the first heat exchanger corresponding to the smoke chamber is provided with a high-temperature flue gas inlet hole and a low-temperature flue gas outlet hole, and the side wall of the first heat exchanger corresponding to the water chamber is provided with a first low-temperature water inlet hole and a first high-temperature water outlet hole; the high-temperature flue gas discharge hole communicates with the high-temperature flue gas inlet hole; the low-temperature flue gas outlet hole communicates with the outside atmosphere; the interior of the second heat exchanger has a low-temperature water chamber and a high-temperature water chamber that are independently distributed and in heat exchange contact. The side wall of the second heat exchanger corresponding to the high-temperature water chamber is provided with a high-temperature jacket water inlet hole and a low-temperature jacket water outlet hole, and the side wall of the second heat exchanger corresponding to the low-temperature water chamber is provided with a second low-temperature water inlet hole and a second high-temperature water outlet hole; the low-temperature jacket water return hole communicates with the low-temperature jacket water outlet hole; the high-temperature jacket water discharge hole is connected to the second high-temperature water outlet hole through a water pipe; the first low-temperature water inlet hole and the second low-temperature water inlet hole are respectively connected to an external water source; the water inlet holes of the flash tank are respectively connected to the first high-temperature water outlet hole and the second high-temperature water outlet hole.

[0008] The beneficial effects of the present invention are as follows:

[0009] 1. First, the smoke chamber and the water chamber inside the first heat exchanger are used for heat exchange. Since the smoke chamber is connected to the high-temperature flue gas discharge hole of the internal combustion engine, a large amount of waste heat of the internal combustion engine flue gas can be recovered, the water vapor content in the flue gas can be reduced, and white smoke can be eliminated; then, the low-temperature water chamber and the high-temperature water chamber inside the second heat exchanger are used for heat exchange. Since the high-temperature water chamber is connected to the high-temperature jacket water discharge hole and the low-temperature jacket water return hole of the internal combustion engine, a large amount of waste heat of the internal combustion engine jacket water can be recovered, and direct discharge of high-temperature jacket water can be avoided, resulting in heat loss and affecting the environment.

[0010] 2. By using the water inlet holes of the flash tank to be respectively connected to the first high-temperature water outlet hole and the second high-temperature water outlet hole, since the water flowing out of the first high-temperature outlet hole has absorbed the waste heat of the internal combustion engine flue gas and the water flowing out of the second high-temperature water outlet hole has absorbed the waste heat of the internal combustion engine jacket water, the water flow after absorbing the waste heat can be turned into industrial steam, meeting the usage requirements of industrial and mining enterprises and increasing the waste heat recovery value of the internal combustion engine.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] Further, it further includes a makeup water pump, and the makeup water pump is placed in the external water source and its water outlet holes are respectively connected to the first low-temperature water inlet hole and the second low-temperature water inlet hole.

[0013] Further, it further includes a circulating water pump, and the circulating water pump is installed on the water pipe and its water inlet hole is connected to the high-temperature jacket water discharge hole, and its water outlet hole is connected to the high-temperature jacket water inlet hole.

[0014] Further, it further includes a steam compressor, and an air inlet of the steam compressor is communicated with an air outlet hole of the flash tank.

[0015] The beneficial effect of the above is: By using the steam compressor to pressurize the water vapor produced by the flash tank, the industrial steam pressure can be increased to meet the usage requirements of industrial and mining enterprises.

[0016] Further, a water outlet hole of the flash tank is communicated with a second low-temperature water inlet hole.

[0017] The beneficial effect of the above is: The water with residual heat produced by the flash tank is returned to the low-temperature water chamber of the second heat exchanger, which can slightly increase the heat of the low-temperature water chamber and improve the heat recovery rate. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of a waste heat recovery system for an internal combustion engine of the present invention.

[0019] In the drawings, the list of components represented by each reference numeral is as follows:

[0020] 1. First heat exchanger, 11. High-temperature flue gas inlet hole, 12. Low-temperature flue gas outlet hole, 13. First low-temperature water inlet hole, 14. First high-temperature water outlet hole, 2. Second heat exchanger, 21. High-temperature cylinder jacket water inlet hole, 22. Low-temperature cylinder jacket water outlet hole, 23. Second low-temperature water inlet hole, 24. Second high-temperature water outlet hole, 3. Flash tank, 4. Internal combustion engine, 41. High-temperature cylinder jacket water discharge hole, 42. Low-temperature cylinder jacket water return hole, 43. High-temperature flue gas discharge hole, 5. Make-up water pump, 6. Circulation water pump, 7. Steam compressor. Detailed Embodiment

[0021] The principles and features of the present invention are described below with reference to the drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0022] As Figure 1 shown, a waste heat recovery system for an internal combustion engine, the internal combustion engine 4 is provided with a high-temperature cylinder jacket water discharge hole 41, a low-temperature cylinder jacket water return hole 42 and a high-temperature flue gas discharge hole 43, and includes: a first heat exchanger 1, a second heat exchanger 2 and a flash tank 3.

[0023] The interior of the first heat exchanger 1 has a smoke chamber and a water chamber that are independently distributed and in heat exchange contact. The side wall of the first heat exchanger 1 corresponding to the smoke chamber is provided with a high-temperature flue gas inlet hole 11 and a low-temperature flue gas outlet hole 12, and the side wall of the first heat exchanger 1 corresponding to the water chamber is provided with a first low-temperature water inlet hole 13 and a first high-temperature water outlet hole 14; the high-temperature flue gas discharge hole 43 communicates with the high-temperature flue gas inlet hole 11; the low-temperature flue gas outlet hole 12 communicates with the outside atmosphere; the interior of the second heat exchanger 2 has a low-temperature water chamber and a high-temperature water chamber that are independently distributed and in heat exchange contact. The side wall of the second heat exchanger 2 corresponding to the high-temperature water chamber is provided with a high-temperature jacket water inlet hole 21 and a low-temperature jacket water outlet hole 22, and the side wall of the second heat exchanger 2 corresponding to the low-temperature water chamber is provided with a second low-temperature water inlet hole 23 and a second high-temperature water outlet hole 24; the low-temperature jacket water return hole 42 communicates with the low-temperature jacket water outlet hole 22; the high-temperature jacket water discharge hole 41 is connected to the second high-temperature water outlet hole 24 through a water pipe; the first low-temperature water inlet hole 13 and the second low-temperature water inlet hole 23 are respectively connected to an external water source; the water inlet holes of the flash tank 3 are respectively connected to the first high-temperature water outlet hole 14 and the second high-temperature water outlet hole 24.

[0024] In some specific embodiments, a make-up water pump 5 may further be included. The make-up water pump 5 is placed in an external water source and its water outlet holes are respectively connected to the first low-temperature water inlet hole 13 and the second low-temperature water inlet hole 23.

[0025] In some specific embodiments, a circulating water pump 6 may further be included. The circulating water pump 6 is installed on the water pipe and its water inlet hole is connected to the high-temperature jacket water discharge hole 41, and its water outlet hole is connected to the high-temperature jacket water inlet hole 21.

[0026] In some specific embodiments, a steam compressor 7 may further be included. The air inlet of the steam compressor 7 is connected to the air outlet hole of the flash tank 3.

[0027] In some specific embodiments, the water outlet hole of the flash tank 3 may be connected to the second low-temperature water inlet hole 23.

[0028] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A waste heat recovery system for an internal combustion engine, the internal combustion engine (4) having a high-temperature cylinder jacket water discharge hole (41), a low-temperature cylinder jacket water return hole (42) and a high-temperature flue gas discharge hole (43), characterized in that, Comprising: A first heat exchanger (1), inside which there are a smoke chamber and a water chamber that are independently distributed and in heat exchange contact. On the side wall of the first heat exchanger (1) corresponding to the smoke chamber, there are a high-temperature flue gas inlet hole (11) and a low-temperature flue gas outlet hole (12), and on the side wall of the first heat exchanger (1) corresponding to the water chamber, there are a first low-temperature water inlet hole (13) and a first high-temperature water outlet hole (14); the high-temperature flue gas discharge hole (43) is communicated with the high-temperature flue gas inlet hole (11); the low-temperature flue gas outlet hole (12) is communicated with the outside atmosphere; A second heat exchanger (2), inside which there are a low-temperature water chamber and a high-temperature water chamber that are independently distributed and in heat exchange contact. On the side wall of the second heat exchanger (2) corresponding to the high-temperature water chamber, there are a high-temperature jacket water inlet hole (21) and a low-temperature jacket water outlet hole (22), and on the side wall of the second heat exchanger (2) corresponding to the low-temperature water chamber, there are a second low-temperature water inlet hole (23) and a second high-temperature water outlet hole (24); the low-temperature jacket water return hole (42) is communicated with the low-temperature jacket water outlet hole (22); the high-temperature jacket water discharge hole (41) is communicated with the second high-temperature water outlet hole (24) through a water pipe; the first low-temperature water inlet hole (13) and the second low-temperature water inlet hole (23) are respectively communicated with an external water source; A flash tank (3), the water inlet holes of which are respectively communicated with the first high-temperature water outlet hole (14) and the second high-temperature water outlet hole (24).

2. The waste heat recovery system for an internal combustion engine according to claim 1, wherein, It further includes a make-up water pump (5), which is placed in the external water source and its water outlet holes are respectively communicated with the first low-temperature water inlet hole (13) and the second low-temperature water inlet hole (23).

3. The waste heat recovery system for an internal combustion engine according to claim 1, wherein It further includes a circulating water pump (6), which is installed on the water pipe and its water inlet hole is communicated with the high-temperature jacket water discharge hole (41), and its water outlet hole is communicated with the high-temperature jacket water inlet hole (21).

4. An internal combustion engine waste heat recovery system according to claim 1, characterized in that, It further includes a steam compressor (7), the air inlet of which is communicated with the air outlet hole of the flash tank (3).

5. A waste heat recovery system for an internal combustion engine according to claim 1, wherein, The water outlet hole of the flash tank (3) is communicated with the second low-temperature water inlet hole (23).

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